[issue21054] Improve indexing of syntax symbols

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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dependencies: +Index 'as' in import and with statements -Derby: Convert the _sre module to use Argument Clinic

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21054>
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